1128. They are distinguished from other genii and spirits in this, that they induce upon the head a kind of suction or attraction, and this is of such a nature that the place where this attraction or suction exists is almost painful. The sensation of suction is just as manifest as though the membranes were being very sensibly sucked in. There is room to doubt whether others could have endured it on account of the pain, but since I had long been accustomed to such attractions of spirits and genii, and indeed very powerful ones, I bore these also without pain.